Renewable fuse plug



sept. 1e, 1924. 1,508,402

S. KUBIAK f REMOVABLE FUSE PLUG Filed Oct. 23 1922 ATTORNEYS PatentedSept. 16, 1924.

PATENT-orifice.

SYLVESTER KUIBIAIK,` F CHICAGO, ILLINOIS.

REN'EWABLE FUSE PLUG.

Application filed October 23, 1922. Serial No. 596,363.

To all whom it may concern:

Be it known that I, SYLvEs'rER KUBIAK, a. citizen of the United States,and a resident of Chicago, in the county of Cook and State of Illinois,have invented ya new and useful Improvement in Renewable Fuse Plugs, ofwhich the following is a full, clear', and exact description.

' My invention relates to improvementsin renewable fuse plugs, and moreparticularly to that type of fuse plug in which the fusible elementy maynot beintentionally rendered inoperative easily, and itV consists in thecombinations, constructions, .and arrangements herein described andclaimed.

An object of my invention is to provide a device of the characterdescribed in which the fusible element consists in a unitwhi'ch may bequickly and easily replaced in the plug. I f

A further object of myinvention 4is to provide a device ofthe characterdescribed in which means is provided for preventing the intentionalintroduction of a relatively heavy conductor in place of the fusibleelement to willfully render the fuse plug inoperative. In the ordinaryrenewable fuse plug, it is relatively easy to introduce a copper wire ora heavy lead wire in place of the strip or lighter wire alreadyprovided.

AA further object of'my invention is to provide a device of thecharacter described in which the fusible elementv of the plug isdisposed directly below a mica window and may be readily observedy eventhough the mica may be somewhat coated with the volatilized elements of'the fused strip.

A further object of my invention'is to provide a device ofthe characterdescribed which is simple in construction, easy to manufacture, andthoroughly practical commercially.

Other objects and advantages will appear in the following specification,and the novel features of the invention'will be particularly pointed outin the appended claims. My invention is illustrated in the accompanyingdrawings, forming };Jart'o'f'thisv application, in .whichr `Figure liisa top plan vview of anembodi- `ment rofmyinvention, V v

Figure 2 is a sectional view 2-2 of Figure 1, y

Figure 3 is 1 a sectional view along the line 3-3 ofFigure 1, and fFigure 4 is a perspective view of therenewable fuse plug element.` i

In carrying out my invention, I make use of' a porcelain body member 1having a bore 2 disposed longitudinally therethrough. The-'bore 2 isprovidedwith an enlarged portion 3 adjacent toits upper end. Arect-angularcavity 4 is provided in the top wall of theubody member 1and the enlarged portionB of the bore '2 communicates therewith. Abinding` screw 5 is disposed in the bore 2 with its head 6 extendingeXteriorly thereof.y The screw 5 is provided with an enlarged threadedportion 7, which threaded portion is arranged to extend within theenlarged portion 3 ofthe bore. In assembling my device, I introducesoftmetal, such as babbitt 8,'into the bore 3 and tamp-itslightly at thebottom of the bore so as to provide an effective collar by means withwhich the threaded portion 7 of the screw 5 may con- ,tact andthereby-accidental displacement of the screw 5 is prevented. A metalwasher 9 is introduced intermediate the head 6 of the screw 5 inthe bodymember 1 so as to insure an effective electrical contact with the centerelectrodey of the ordinary type of lamp socket when the plug isintroduced therein. l

vThe body member 1 is provided on one along the line 4side thereof andyadjacent one end of the rectangular cavity 4l with a longitudinalgroove l0 extending the entire length of the body member 1 andcommunicating at its 4upper end with the cavity 4. A standard screw plugshell 11, which is formed so as to enter and engage with the ordinarytype of standard light socket, -is .disposed concentric with the bodymember l and has sek.cured thereto by means of a screw 12 a bindingplate 13. yThe bindingy plate 13 issecured to `the inner side of theshell v11 and occupies aportion of the groove 10. The purpose of havingthe groove lO'eXtend the entire length of the body member 1. is so thatthe shell may beplaced upon the body memberiafterthe binding plate 13Vhas been having a bore extending vertically therethrough eonilnunieatingat its upper end with said cavity, a pair of fuse terminals, one of saidterminals being disposed Within said bore but not exposed in saidcavity, that portion of said fuse terminal Within said cavity beingenlarged, said fuse terminal assoeiated with said bore also having anenlarged portion at its opposite end, whereby said terminal may rotatein said bore but 10 may not become dislodged from said bore, and afusible element, one terminal of which is adapted to be connected to theouter por tion of said fuse terminal in said cavity, and the otherterminal of which is connected 15 to the remaining terminal on said bodymember.

SYLVESTER KUBIAK.

